Quick Answer
The answer is the show interface trunk command. This command is correct because it directly displays the trunking parameters for each interface, including the VLANs allowed on the trunk, the trunking mode, and the encapsulation type such as 802.1Q. On the Cisco DCCOR and CCNP Data Center Core 350-601 exam, this question tests your ability to verify VLAN propagation across a trunk link, often appearing in troubleshooting scenarios where you must confirm that specific VLANs are permitted or blocked. A common trap is confusing this with show interfaces trunk, which is the same command, or with show vlan, which shows VLAN membership but not trunk permissions. Remember the memory tip: “Show trunk to see what’s allowed, show vlan to see what’s proud.”
This 350-601 practice question tests your understanding of network. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which command displays the VLANs allowed on a trunk interface?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
show running-config interface
Why wrong: It shows configuration but is not the quickest way to verify allowed VLANs.
show vlan
Why wrong: show vlan shows VLAN database, not trunk information.
show interface switchport
Why wrong: This shows switchport mode but not allowed VLANs.
show interface trunk
This command directly shows trunk status and allowed VLANs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
show interface trunk
The 'show interface trunk' command displays trunk parameters, including the VLANs allowed on the trunk interface. This command shows the trunking mode, encapsulation (e.g., 802.1Q), and the allowed VLAN list for each trunk port. It is the direct command to verify which VLANs are permitted on a specific trunk link.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
show running-config interface
Why it's wrong here
It shows configuration but is not the quickest way to verify allowed VLANs.
show vlan
show interface switchport
Why it's wrong here
This shows switchport mode but not allowed VLANs.
show interface trunk
Why this is correct
This command directly shows trunk status and allowed VLANs.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse 'show interface switchport' (which shows trunking status and native VLAN) with 'show interface trunk' (which shows the allowed VLAN list), leading them to choose option C instead of D.
Trap categories for this question
Command / output trap
It shows configuration but is not the quickest way to verify allowed VLANs.
Detailed technical explanation
The 'show interface trunk' command outputs the trunking mode (e.g., 'on', 'desirable', 'auto'), encapsulation (802.1Q or ISL), and the list of allowed VLANs in the format 'Vlans allowed on trunk'. This command also shows the active VLANs on the trunk, which can differ from the allowed list if a VLAN is pruned or not created. In a real-world scenario, if a trunk is not passing traffic for a specific VLAN, this command helps quickly identify whether the VLAN is not allowed, not active, or pruned by VTP.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
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FAQ
Network — This question tests Network — Read the scenario before looking for a memorised answer..
The correct answer is: show interface trunk — The 'show interface trunk' command displays trunk parameters, including the VLANs allowed on the trunk interface. This command shows the trunking mode, encapsulation (e.g., 802.1Q), and the allowed VLAN list for each trunk port. It is the direct command to verify which VLANs are permitted on a specific trunk link.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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